EP2313218B1 - Verfahren und vorrichtung zur herstellung eines aus plastischer masse bestehenden kreiszylindrischen körpers mit innenliegenden wendelförmigen ausnehmungen - Google Patents

Verfahren und vorrichtung zur herstellung eines aus plastischer masse bestehenden kreiszylindrischen körpers mit innenliegenden wendelförmigen ausnehmungen Download PDF

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Publication number
EP2313218B1
EP2313218B1 EP09779827A EP09779827A EP2313218B1 EP 2313218 B1 EP2313218 B1 EP 2313218B1 EP 09779827 A EP09779827 A EP 09779827A EP 09779827 A EP09779827 A EP 09779827A EP 2313218 B1 EP2313218 B1 EP 2313218B1
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EP
European Patent Office
Prior art keywords
rotation
friction surface
axis
cylindrical body
surface arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09779827A
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German (de)
English (en)
French (fr)
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EP2313218A1 (de
Inventor
Arno Friedrichs
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Friedrichs Arno
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Individual
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Publication of EP2313218A1 publication Critical patent/EP2313218A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K5/00—Making tools or tool parts, e.g. pliers
    • B21K5/02—Making tools or tool parts, e.g. pliers drilling-tools or other for making or working on holes
    • B21K5/04—Making tools or tool parts, e.g. pliers drilling-tools or other for making or working on holes twisting-tools, e.g. drills, reamers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/18—Making articles shaped as bodies of revolution cylinders, e.g. rolled transversely cross-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/10—Making helical bodies or bodies having parts of helical shape twist-drills; screw-taps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/003—Apparatus or processes for treating or working the shaped or preshaped articles the shaping of preshaped articles, e.g. by bending
    • B28B11/006—Making hollow articles or partly closed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • the invention relates to a method and an apparatus for producing a circular-cylindrical body consisting of plastic mass, in particular a sintered metal blank, which has at least one helical inner recess extending in the interior of the body, according to the preamble of patent claim 1 or claim 7.
  • Such bodies are needed in particular in the production of drilling tools or drilling tool inserts made of hard metal or ceramic materials. Due to the helical course of the at least one inner recess, which serves in the finished drilling tool for the supply of coolant or lubricant in the cutting area, the drilling tool can be equipped with helical flutes, which is often sought to provide favorable cutting and machining properties of advantage and therefore.
  • the mass issuing from the press nozzle is generally very sensitive to pressure, ie the emerging blank deforms extremely easily when an external force is applied. Since such deformations are no longer reversible and thus lead to at least partially unusable blanks, it has been attempted to further develop the extrusion process so that the blank has helically extending cooling channels already on exiting the extrusion die. According to a proposal (see eg EP-A-0 465 946 ) this is achieved by the fact that on the inner circumference of the extrusion nozzle helically extending guide rails are mounted, which impose a swirling motion on the exiting plastic mass.
  • the nozzle mouthpiece and / or a hub shaped like a propeller, to which the abovementioned flexible limbs are fastened are set into rotary motion during the extrusion process, which in turn produces an outer smooth blank with inner helical channels or recesses can.
  • a method and an apparatus for producing a sintered metal blank with internal helical recesses are already known.
  • a substantially circular-cylindrical body is produced, for example extruded, with at least one inner recess running in a straight line inside it.
  • This body is cut to a desired length and then subjected to rolling over its entire length on a support by means of a friction surface arrangement, whose velocity changes linearly and steadily over the length of the body, whereby the body is twisted uniformly.
  • This twisting is done using an axis of rotation that intersects the longitudinal axis of the body.
  • sintered metal blanks can be produced in which the pitch angle of the at least one helical inner recess over the entire length of the blank is kept constant and within narrow tolerated limits. As a result, it can generally be ensured that the at least one inner recess does not come too close to the flute, which still has to be introduced.
  • the object of the invention is therefore to provide a method and an apparatus for producing a circular mass consisting of plastic mass body, which is or these higher requirements.
  • the advantages of the invention are in particular that by means of the claimed method of plastic mass existing circular cylindrical body can be produced, at least one helical inner recess over the entire length of the body has a very constant, held within very narrow tolerated limits helix angle.
  • This advantage is based on the fact that the individual longitudinal sections of the circular cylindrical body each travel the same way during the rolling process.
  • the individual longitudinal sections of the circular cylindrical body different lengths back paths.
  • the paths which cover longitudinal sections located close to the axis of rotation during the rolling process are comparatively small, while those longitudinal sections which are arranged away from the axis of rotation cover comparatively large paths during the rolling process.
  • FIGS. 1 to 3 is denoted by the reference numeral 10 to a predetermined length L * tailored, ie cut to length sintered metal blank, which consists for example of a hard metal powder with kneaded binding or adhesive.
  • This sintered metal blank is produced for example by extrusion, in such a way that it has a straight and continuous, shown in the figures with dotted line inner recess 12 which extends parallel to the center axis 14 of the circular cylindrical blank 10.
  • the production of the sintered metal blank is preferably carried out in the extrusion process with the aid of an extrusion die with a suitable core.
  • the blank 10 has a relatively soft consistency, so that the handling, such. As the transport, must be done very carefully to prevent irreversible deformation. Therefore, the blank is preferably performed immediately after exiting the extrusion die on an air cushion and directed to the pad 16 shown in the figures, which in the FIGS. 1 and 3 coincides with the presentation plane.
  • the blank is due to the consistency of the extruded mass on its outside sticky, so that a good adhesion with the support surface 16 results.
  • a circular segment disc 18 with a bottom-side friction surface 20 is arranged.
  • the circular segment disc 18 is rotatable about an axis of rotation 22 which is perpendicular to the surface of the support 16 and on the friction surface.
  • the vertical distance AV between the surfaces 16 and 20 is preferably adjustable, which is indicated by the double arrow V in FIG. 2 is indicated. This vertical distance AV corresponds to the diameter D of the blank 10.
  • the blank 10 is placed on the support 16 so that its longitudinal axis 14, the axis of rotation 22 of the circular segment disc 18 cuts. Subsequently, the circular segment disc is lowered controlled so that it touches the blank 10 along a line which is offset diametrically to the bottom-side contact line of the blank 10 with the support 16. This alignment is in the Figures 1 and 2 shown.
  • the circular segment disc 18 is pivoted at an angular velocity ⁇ . Due to the frictional contact between the surface 20 of the circular segment disc 18 and the blank 10 of the blank is taken by rolling on the surface of the support 16 at a speed that changes linearly and steadily along the axis of the blank 10.
  • the rolling speed at the inner end of the blank 10 is VWI and the rolling speed at the outer end of the blank 10 is designated VWA.
  • the circular segment disc 18 is held in contact with the rod-shaped blank 10 with as little contact force as possible, specifically during the entire twisting operation, ie during the entire pivoting about the pivoting angle ⁇ (see FIG. Fig. 3 ).
  • a change in the axis of rotation in contrast to the reference to the FIGS. 1 to 3 described prior art during the rolling process, a change in the axis of rotation.
  • This change in the axis of rotation takes place in particular such that all longitudinal sections of the blank during the rolling process each cover the same rolling distance.
  • the rolling process takes place in two successive steps, wherein in the first step, a rolling movement about a first axis of rotation and in the second step, a rolling movement about a second axis of rotation takes place.
  • a method according to the invention serves as well as that of EP-B1-1 230 046 known method for producing a circular cylindrical body consisting of plastic mass, in particular a sintered metal blank, which has at least one helical inner recess running in the interior of the body.
  • the body is as well as in the EP-B1-1 230 046 known method initially prepared with a straight course of the inner recess, for example extruded.
  • the extruded body is cut to a desired length. Subsequently, it is subjected to a rolling process with support over its entire length on a support with a friction surface arrangement, so that a twisting of the body takes place.
  • the rolling process takes place in two successive steps, wherein in the first step, a rolling movement about a first axis of rotation and in the second step, a rolling movement about a second axis of rotation, wherein the second axis of rotation is different from the first axis of rotation.
  • the rolling process takes place in such a way that each longitudinal section of the circular-cylindrical body travels the same path during the rolling process. The Rolling direction is maintained in the successive steps.
  • the positioning of the axes of rotation is such that during the first step, the axis of rotation intersects the center line of the circular cylindrical body in the region of an axial end surface of the circular cylindrical body and during the second step, the axis of rotation of the center line of the circular cylindrical body in the area the other axial end surface of the circular cylindrical body intersects.
  • the positioning of the axes of rotation is such that during the first step, the axis of rotation intersects the extended centerline of the circular cylindrical body at a predetermined distance from an axial end surface of the circular cylindrical body and during the second step the axis of rotation extends Center line of the circular cylindrical body at the same predetermined distance from the other axial end surface of the circular cylindrical body intersects.
  • Another embodiment of the invention is to change the axis of rotation about which the rolling movement occurs during the rolling movement several times or continuously.
  • FIG. 4 shows a sketch to illustrate the change of the axis of rotation during the rolling process.
  • the circular cylindrical body 10 is in the position in which it is represented by the reference numeral 10.
  • a twisting of the body using the Rotation axis D1 which runs perpendicular to the plane of the drawing.
  • the body is moved through an angle in the FIG. 4 in the vicinity of the rotation axis D1 is denoted by "a".
  • the rotation axis D1 intersects the center line M of the circular cylindrical body at a predetermined distance from an axial end portion of the circular cylindrical body.
  • the velocity changes linearly and steadily over the length of the body.
  • the body is in a position offset by the angle ⁇ . He is there with the reference numeral 10 'provided.
  • a second step the body is twisted using a rotation axis D2. This also runs perpendicular to the drawing plane.
  • the rotation axis D2 intersects the center line M 'of the circular cylindrical body 10' at a predetermined distance from the other axial end surface of the circular cylindrical body.
  • the body is moved through an angle, which in the FIG. 4 in the vicinity of the rotation axis D2 is also denoted by " ⁇ ". Even with this twisting, the speed changes linearly and steadily over the length of the body.
  • the body is in a position offset by the angle ⁇ . He is there with the reference numeral 10 "provided.
  • the entire twisting process is tuned to the effect that the different longitudinal sections of the circular cylindrical body cover the same distance or twisting distance during the entire twisting process. This is in the FIG. 4 illustrated by the longitudinal sections A1 and A2 of the circular cylindrical body.
  • the longitudinal section A1 of the circular cylindrical body is in the first step to those in the FIG. 4 moved with s1 path. After completion of the first step this longitudinal section is located in the body 10 'and is designated there by A1'.
  • FIG. 5 shows a sketch to illustrate a device for carrying out the method according to the invention.
  • This device has a flat support surface 16.
  • a Wälzin 23 is arranged in the vertical distance AV to this .
  • This has a pad surface side friction surface 24.
  • the Wälzin 23 is rotatable about an axis of rotation 25 which is perpendicular to the surface of the support surface 16. This rotation takes place at an angular velocity ⁇ .
  • the vertical distance AV between the support surface 16 and the Wälzsay 23 is adjustable, as indicated by the double arrow V.
  • the rolling movement takes place using the axis of rotation 25.
  • the rolling movement takes place using a second axis of rotation 26, which is also perpendicular to the surface of the support surface 16.
  • This rotation also takes place at the angular velocity ⁇ .
  • the rolling direction in the second step coincides with the rolling direction in the first step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Rolling Contact Bearings (AREA)
  • Forging (AREA)
  • Physical Vapour Deposition (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
EP09779827A 2008-07-16 2009-06-18 Verfahren und vorrichtung zur herstellung eines aus plastischer masse bestehenden kreiszylindrischen körpers mit innenliegenden wendelförmigen ausnehmungen Active EP2313218B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008033413A DE102008033413A1 (de) 2008-07-16 2008-07-16 Verfahren und Vorrichtung zur Herstellung eines aus plastischer Masse bestehenden kreiszylindrischen Körpers mit innenliegenden wendelförmigen Ausnehmungen
PCT/EP2009/057583 WO2010006873A1 (de) 2008-07-16 2009-06-18 Verfahren und vorrichtung zur herstellung eines aus plastischer masse bestehenden kreiszylindrischen körpers mit innenliegenden wendelförmigen ausnehmungen

Publications (2)

Publication Number Publication Date
EP2313218A1 EP2313218A1 (de) 2011-04-27
EP2313218B1 true EP2313218B1 (de) 2011-10-19

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EP09779827A Active EP2313218B1 (de) 2008-07-16 2009-06-18 Verfahren und vorrichtung zur herstellung eines aus plastischer masse bestehenden kreiszylindrischen körpers mit innenliegenden wendelförmigen ausnehmungen

Country Status (9)

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US (2) US8850861B2 (enExample)
EP (1) EP2313218B1 (enExample)
JP (1) JP5453414B2 (enExample)
KR (1) KR101264755B1 (enExample)
CN (1) CN102099134B (enExample)
AT (1) ATE529206T1 (enExample)
DE (1) DE102008033413A1 (enExample)
ES (1) ES2373634T3 (enExample)
WO (1) WO2010006873A1 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019057351A1 (de) 2017-09-21 2019-03-28 Arno Friedrichs Verfahren und vorrichtung zur herstellung eines aus plastischer masse bestehenden kreiszylindrischen körpers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014115760A1 (de) 2014-10-30 2016-05-04 Arno Friedrichs Schneidwerkzeug mit innenliegenden, spiralförmig verlaufenden Kühlmittelkanälen mit sich veränderndem Steigungswinkel
CN109249026A (zh) * 2018-11-12 2019-01-22 深圳艾利佳材料科技有限公司 一种用粉末挤出轧制的成型工艺

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173675A1 (de) 1984-08-28 1986-03-05 Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) Verfahren und Vorrichtung zur Herstellung von, insbesondere metallischen, Werkstücken, vorzugsweise aus Stahl
JPH0663003B2 (ja) 1989-09-08 1994-08-17 東芝タンガロイ株式会社 押出し成形機
DE4120165C2 (de) 1990-07-05 1995-01-26 Friedrichs Konrad Kg Strangpreßwerkzeug zur Herstellung eines Hartmetall- oder Keramikstabes
JPH04198405A (ja) 1990-11-28 1992-07-17 Kobe Steel Ltd 穴付硬質長尺素材の製造方法
JPH04198404A (ja) 1990-11-28 1992-07-17 Kobe Steel Ltd 穴付硬質長尺素材の製造方法
JPH04210407A (ja) 1990-11-30 1992-07-31 Kobe Steel Ltd 油穴付ドリル，エンドミルの製造方法
US5152061A (en) 1992-02-19 1992-10-06 Tesma International Inc. Cold-forming of toothed wheels from sheet steel
DE50003038D1 (de) 1999-09-09 2003-08-28 Arno Friedrichs Verfahren und vorrichtung zur herstellung eines sintermetall-rohlings mit innenliegenden, wendelförmigen ausnehmungen
DE10356111B4 (de) * 2003-11-27 2006-10-12 Zf Friedrichshafen Ag Kaltumformverfahren zur Herstellung von einteiligen Kugelzapfen
CN1974054A (zh) * 2006-12-08 2007-06-06 青特集团有限公司 多阶细长轴的制造工艺

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019057351A1 (de) 2017-09-21 2019-03-28 Arno Friedrichs Verfahren und vorrichtung zur herstellung eines aus plastischer masse bestehenden kreiszylindrischen körpers

Also Published As

Publication number Publication date
JP5453414B2 (ja) 2014-03-26
US8850861B2 (en) 2014-10-07
US9044797B2 (en) 2015-06-02
KR20110031950A (ko) 2011-03-29
EP2313218A1 (de) 2011-04-27
ES2373634T3 (es) 2012-02-07
ATE529206T1 (de) 2011-11-15
US20110113846A1 (en) 2011-05-19
US20150027188A1 (en) 2015-01-29
KR101264755B1 (ko) 2013-05-15
DE102008033413A1 (de) 2010-01-21
WO2010006873A1 (de) 2010-01-21
CN102099134B (zh) 2013-05-22
JP2011527943A (ja) 2011-11-10
CN102099134A (zh) 2011-06-15

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